LG 071aadj free download

File name 071aadj.pdf

ADJUSTMENT Y Safety Precautions : Screen Voltage Adjustment 1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to Test Point : RK (Red Cathode of CPT Board) prevent the risk of electric shock and protect the Adjust : Screen Control of FBT instrument. 2. Never disconnect leads while the TV receiver is on. 3. Don't short any portion of circuits while power is on. 1) Tune the TV set to receive a color bar pattern. 4. The adjustment must be done by the correct appliances. 2) Press PSM (RED) button on remote controller. (standard But this is changeable in view of productivity. picture) 5. Unless otherwise noted, set the line voltage to 3) Connect the probe of oscilloscope to the RK (Red 230Vac!10%, 50Hz. Cathode) of CPT Board. 4) Adjust Screen Volume of FBT so that the waveform is the Y Test Equipment required same as below figure. 1. RF signal generator (with pattern generator) 500V 2. DC Power Supply 200 3. Multimeter (volt meter) 4. Oscilloscope 5. Color analyzer 150 Black Level(DC) 100 : RF AGC (Automatic Gain Control) Adjustment 50 Test Point : AGC TP (C101) GND Adjust : Remote Control The waveform of RK(Red Cathode) of CPT Board The RF AGC was aligned at the time of manufacture for optimum performance over a wide range conditions. Readjustment of RF AGC should not be necessary unless unusual local conditions exist, such as ; : Focus Adjustment 1) Channel interference in a CATV system. NOTE: This adjustment should be performed after warming 2) Picture bending and/or color beats, which are unusually up for 10 minutes. due to excessive RF signal input when the receiver is too close to a transmitting tower or when the receiver is Test Point : Observing Display connected to an antenna dist